Crypto asset exchange OKCoin, which was forced to shut down its Chineses operations following a country-wide ban last year, announced that it was won regulatory approval to expand its operations to 20 new U.S. states. The exchange, which now has a headquarters in San Francisco, had previously operated only in California. Californians remain the only customers who will be allowed to trade directly against the U.S. dollar. Traders in other states will have access to crypto-to-crypto trading only.